Find the area of square QRST with the following vertices Q(-2, 3), R(1, 0), S(4, 3) and T(1, 6).

Answer 1

make a quick sketch to see how the square is positioned.
so all we need is the length of one side, e.g.. side QR
QR^2 = √(3^2+3^2) = √18
So area = √18 √18 = 18

Answer 2

Find the area of square QRST with the following vertices Q(-2, 3), R(1, 0), S(4, 3) and T(1, 6).